Isset

If exist php

if (isset($var)) {
  // Code here
}

Php see if undefined

if (isset($variable)) { /* do something */ };

Isset js

if (typeof obj.foo !== 'undefined') {
}

Js isset

if (typeof obj.foo !== 'undefined') {
  // your code here
}

Source: stackoverflow.com

Isset

<?php
if (isset($_POST['name'])) $name = $_POST['name'];
else $name = '(enter your name)';
echo <<<_END
<html>
    <head>
        <title>Test</title>
    </head>
    <body>
    Your name is $name<br />
    <form method = 'post' action = 'count.php'>
        What's your name?
        <input type='text' name='name' />
        <input type='submit' />
    </form>
    </body>
</html>
_END
?>

Source: stackoverflow.com

Isset

<?php

$a = "3.1416";

if (isset($a)) // la variable $a está definida

unset($a); //ahora ya no está definida

?>

-1

Source: educacionadistancia.juntadeandalucia.es

Similar codes

0 vote137 views1 answer
Php try catch non object
PHP
0 vote144 views1 answer
Get current tax page
PHP
2 votes143 views2 answers
Illuminate\Contracts\Container\BindingResolutionException Target class [SlugController] does not exist.
PHP
0 vote132 views1 answer
Php debug backtrace last function
PHP
0 vote141 views1 answer
Laravel chunk select
PHP
0 vote292 views1 answer
Php first 20 words
PHP
0 vote169 views1 answer
How to prevent user to add duplicate card in stripe using laravel
PHP Laravel
3 votes135 views2 answers
How to use required_with in laravel to array element
PHP
0 vote182 views1 answer
Blade Keep input values after failed validation
PHP
0 vote139 views1 answer
Xdebug phpstorm
PHP